Joining oxide ceramic matrix composites by ionotropic gelation
Joining oxide ceramic matrix composites by ionotropic gelation
复制标题
DOI：
10.1111/ijac.13507
复制
发表时间：
2020-04
影响因子：
2.1
通讯作者：
Renato S. M. Almeida;Hedieh Farhandi;K. Tushtev;K. Rezwan
中科院分区：
文献类型：
--
作者：
Renato S. M. Almeida;Hedieh Farhandi;K. Tushtev;K. Rezwan
复杂形状的全氧化物陶瓷基复合材料（Ox-CMC）的生产受到其现有加工方法以及缺乏适用的连接技术的限制。因此，我们提出了一种新的方法加入Ox-CMC的基础上凝胶化的浆料与多糖聚合物藻酸盐。对于这项调查，Nextel 610/氧化铝-氧化锆复合材料的生产使用藻酸盐作为粘合剂和醋酸铝作为胶凝剂。通过显微组织分析和单搭接压缩剪切试验研究了该技术的连接性能。为此，使用含有藻酸盐的浆料在加工的不同阶段连接两个复合板：凝胶状态、干燥的绿色体和烧结后。在凝胶或绿色状态下连接复合材料板是成功的，因为接头显示出与复合材料板的层间剪切强度相似的剪切强度值。接头的质量归因于复合板的海藻酸盐链与接头之间的相互作用。我们还表明，即使加入已经烧结的Ox-CMC是可行的。然而，致密化裂纹和较低的剪切强度观察到这种情况下。
The production of complex-shaped all-oxide ceramic matrix composites (Ox-CMC) is somewhat restricted by their current processing methods, as well as by the lack of applicable joining techniques. Thus, we present a new method for joining Ox-CMCs based on the gelation of slurries with the polysaccharide polymer alginate. For this investigation, Nextel 610/alumina-zirconia composites were produced using alginate as binder and aluminum acetate as gelling agent. The joining capabilities of this technique were investigated with microstructural analyses and single-lap compression shear tests. For that, a slurry-containing alginate was used to join two composite plates at different stages of the processing: gel state, dried green body and after sintering. Joining composites plates in their gel or green state was successful as the joints showed shear strength values similar to the interlaminar shear strength of the composites plates. The quality of the joints was attributed to the interactions between the alginate chains of the composite plates and the joint. We also show that even the joining of already sintered Ox-CMCs is feasible. However, densification cracks and lower shear strength are observed for such cases.